v4.19.13 snapshot.
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
new file mode 100644
index 0000000..ece367e
--- /dev/null
+++ b/fs/nfs/pnfs.h
@@ -0,0 +1,824 @@
+/*
+ * pNFS client data structures.
+ *
+ * Copyright (c) 2002
+ * The Regents of the University of Michigan
+ * All Rights Reserved
+ *
+ * Dean Hildebrand <dhildebz@umich.edu>
+ *
+ * Permission is granted to use, copy, create derivative works, and
+ * redistribute this software and such derivative works for any purpose,
+ * so long as the name of the University of Michigan is not used in
+ * any advertising or publicity pertaining to the use or distribution
+ * of this software without specific, written prior authorization. If
+ * the above copyright notice or any other identification of the
+ * University of Michigan is included in any copy of any portion of
+ * this software, then the disclaimer below must also be included.
+ *
+ * This software is provided as is, without representation or warranty
+ * of any kind either express or implied, including without limitation
+ * the implied warranties of merchantability, fitness for a particular
+ * purpose, or noninfringement. The Regents of the University of
+ * Michigan shall not be liable for any damages, including special,
+ * indirect, incidental, or consequential damages, with respect to any
+ * claim arising out of or in connection with the use of the software,
+ * even if it has been or is hereafter advised of the possibility of
+ * such damages.
+ */
+
+#ifndef FS_NFS_PNFS_H
+#define FS_NFS_PNFS_H
+
+#include <linux/refcount.h>
+#include <linux/nfs_fs.h>
+#include <linux/nfs_page.h>
+#include <linux/workqueue.h>
+
+struct nfs4_opendata;
+
+enum {
+ NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
+ NFS_LSEG_ROC, /* roc bit received from server */
+ NFS_LSEG_LAYOUTCOMMIT, /* layoutcommit bit set for layoutcommit */
+ NFS_LSEG_LAYOUTRETURN, /* layoutreturn bit set for layoutreturn */
+ NFS_LSEG_UNAVAILABLE, /* unavailable bit set for temporary problem */
+};
+
+/* Individual ip address */
+struct nfs4_pnfs_ds_addr {
+ struct sockaddr_storage da_addr;
+ size_t da_addrlen;
+ struct list_head da_node; /* nfs4_pnfs_dev_hlist dev_dslist */
+ char *da_remotestr; /* human readable addr+port */
+};
+
+struct nfs4_pnfs_ds {
+ struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */
+ char *ds_remotestr; /* comma sep list of addrs */
+ struct list_head ds_addrs;
+ struct nfs_client *ds_clp;
+ refcount_t ds_count;
+ unsigned long ds_state;
+#define NFS4DS_CONNECTING 0 /* ds is establishing connection */
+};
+
+struct pnfs_layout_segment {
+ struct list_head pls_list;
+ struct list_head pls_lc_list;
+ struct pnfs_layout_range pls_range;
+ refcount_t pls_refcount;
+ u32 pls_seq;
+ unsigned long pls_flags;
+ struct pnfs_layout_hdr *pls_layout;
+};
+
+enum pnfs_try_status {
+ PNFS_ATTEMPTED = 0,
+ PNFS_NOT_ATTEMPTED = 1,
+ PNFS_TRY_AGAIN = 2,
+};
+
+#ifdef CONFIG_NFS_V4_1
+
+#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
+
+/*
+ * Default data server connection timeout and retrans vaules.
+ * Set by module parameters dataserver_timeo and dataserver_retrans.
+ */
+#define NFS4_DEF_DS_TIMEO 600 /* in tenths of a second */
+#define NFS4_DEF_DS_RETRANS 5
+#define PNFS_DEVICE_RETRY_TIMEOUT (120*HZ)
+
+/* error codes for internal use */
+#define NFS4ERR_RESET_TO_MDS 12001
+#define NFS4ERR_RESET_TO_PNFS 12002
+
+enum {
+ NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
+ NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
+ NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
+ NFS_LAYOUT_RETURN, /* layoutreturn in progress */
+ NFS_LAYOUT_RETURN_LOCK, /* Serialise layoutreturn */
+ NFS_LAYOUT_RETURN_REQUESTED, /* Return this layout ASAP */
+ NFS_LAYOUT_INVALID_STID, /* layout stateid id is invalid */
+ NFS_LAYOUT_FIRST_LAYOUTGET, /* Serialize first layoutget */
+};
+
+enum layoutdriver_policy_flags {
+ /* Should the pNFS client commit and return the layout upon truncate to
+ * a smaller size */
+ PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
+ PNFS_LAYOUTRET_ON_ERROR = 1 << 1,
+ PNFS_READ_WHOLE_PAGE = 1 << 2,
+ PNFS_LAYOUTGET_ON_OPEN = 1 << 3,
+};
+
+struct nfs4_deviceid_node;
+
+/* Per-layout driver specific registration structure */
+struct pnfs_layoutdriver_type {
+ struct list_head pnfs_tblid;
+ const u32 id;
+ const char *name;
+ struct module *owner;
+ unsigned flags;
+ unsigned max_deviceinfo_size;
+
+ int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
+ int (*clear_layoutdriver) (struct nfs_server *);
+
+ struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
+ void (*free_layout_hdr) (struct pnfs_layout_hdr *);
+
+ struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
+ void (*free_lseg) (struct pnfs_layout_segment *lseg);
+ void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
+ struct pnfs_layout_segment *lseg,
+ struct list_head *free_me);
+
+ void (*return_range) (struct pnfs_layout_hdr *lo,
+ struct pnfs_layout_range *range);
+
+ /* test for nfs page cache coalescing */
+ const struct nfs_pageio_ops *pg_read_ops;
+ const struct nfs_pageio_ops *pg_write_ops;
+
+ struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
+ void (*mark_request_commit) (struct nfs_page *req,
+ struct pnfs_layout_segment *lseg,
+ struct nfs_commit_info *cinfo,
+ u32 ds_commit_idx);
+ void (*clear_request_commit) (struct nfs_page *req,
+ struct nfs_commit_info *cinfo);
+ int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
+ int max);
+ void (*recover_commit_reqs) (struct list_head *list,
+ struct nfs_commit_info *cinfo);
+ struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
+ struct page *page);
+ int (*commit_pagelist)(struct inode *inode,
+ struct list_head *mds_pages,
+ int how,
+ struct nfs_commit_info *cinfo);
+
+ int (*sync)(struct inode *inode, bool datasync);
+
+ /*
+ * Return PNFS_ATTEMPTED to indicate the layout code has attempted
+ * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
+ */
+ enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
+ enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
+
+ void (*free_deviceid_node) (struct nfs4_deviceid_node *);
+ struct nfs4_deviceid_node * (*alloc_deviceid_node)
+ (struct nfs_server *server, struct pnfs_device *pdev,
+ gfp_t gfp_flags);
+
+ int (*prepare_layoutreturn) (struct nfs4_layoutreturn_args *);
+
+ void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
+ int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
+ int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);
+};
+
+struct pnfs_layout_hdr {
+ refcount_t plh_refcount;
+ atomic_t plh_outstanding; /* number of RPCs out */
+ struct list_head plh_layouts; /* other client layouts */
+ struct list_head plh_bulk_destroy;
+ struct list_head plh_segs; /* layout segments list */
+ struct list_head plh_return_segs; /* invalid layout segments */
+ unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
+ unsigned long plh_retry_timestamp;
+ unsigned long plh_flags;
+ nfs4_stateid plh_stateid;
+ u32 plh_barrier; /* ignore lower seqids */
+ u32 plh_return_seq;
+ enum pnfs_iomode plh_return_iomode;
+ loff_t plh_lwb; /* last write byte for layoutcommit */
+ struct rpc_cred *plh_lc_cred; /* layoutcommit cred */
+ struct inode *plh_inode;
+};
+
+struct pnfs_device {
+ struct nfs4_deviceid dev_id;
+ unsigned int layout_type;
+ unsigned int mincount;
+ unsigned int maxcount; /* gdia_maxcount */
+ struct page **pages;
+ unsigned int pgbase;
+ unsigned int pglen; /* reply buffer length */
+ unsigned char nocache : 1;/* May not be cached */
+};
+
+#define NFS4_PNFS_GETDEVLIST_MAXNUM 16
+
+struct pnfs_devicelist {
+ unsigned int eof;
+ unsigned int num_devs;
+ struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
+};
+
+extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
+extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
+
+/* nfs4proc.c */
+extern size_t max_response_pages(struct nfs_server *server);
+extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
+ struct pnfs_device *dev,
+ struct rpc_cred *cred);
+extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout);
+extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
+
+/* pnfs.c */
+void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
+void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
+
+void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, struct nfs_fsinfo *);
+void unset_pnfs_layoutdriver(struct nfs_server *);
+void pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio);
+void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
+int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
+void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
+ struct nfs_page *req, u64 wb_size);
+void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
+int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
+size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
+ struct nfs_page *prev, struct nfs_page *req);
+void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
+struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
+void pnfs_layoutget_free(struct nfs4_layoutget *lgp);
+void pnfs_free_lseg_list(struct list_head *tmp_list);
+void pnfs_destroy_layout(struct nfs_inode *);
+void pnfs_destroy_all_layouts(struct nfs_client *);
+int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
+ struct nfs_fsid *fsid,
+ bool is_recall);
+int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
+ bool is_recall);
+bool nfs4_layoutreturn_refresh_stateid(nfs4_stateid *dst,
+ struct pnfs_layout_range *dst_range,
+ struct inode *inode);
+void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
+void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
+ const nfs4_stateid *new,
+ bool update_barrier);
+int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
+ struct list_head *tmp_list,
+ const struct pnfs_layout_range *recall_range,
+ u32 seq);
+int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
+ struct list_head *tmp_list,
+ const struct pnfs_layout_range *recall_range,
+ u32 seq);
+int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
+ struct list_head *lseg_list);
+bool pnfs_roc(struct inode *ino,
+ struct nfs4_layoutreturn_args *args,
+ struct nfs4_layoutreturn_res *res,
+ const struct rpc_cred *cred);
+void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
+ struct nfs4_layoutreturn_res *res,
+ int ret);
+bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
+void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
+void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
+int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
+int pnfs_generic_sync(struct inode *inode, bool datasync);
+int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
+int _pnfs_return_layout(struct inode *);
+int pnfs_commit_and_return_layout(struct inode *);
+void pnfs_ld_write_done(struct nfs_pgio_header *);
+void pnfs_ld_read_done(struct nfs_pgio_header *);
+void pnfs_read_resend_pnfs(struct nfs_pgio_header *);
+struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
+ struct nfs_open_context *ctx,
+ loff_t pos,
+ u64 count,
+ enum pnfs_iomode iomode,
+ bool strict_iomode,
+ gfp_t gfp_flags);
+void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
+ const nfs4_stateid *arg_stateid,
+ const struct pnfs_layout_range *range,
+ const nfs4_stateid *stateid);
+
+void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
+ struct pnfs_layout_segment *lseg,
+ bool (*is_after)(const struct pnfs_layout_range *lseg_range,
+ const struct pnfs_layout_range *old),
+ bool (*do_merge)(struct pnfs_layout_segment *lseg,
+ struct pnfs_layout_segment *old),
+ struct list_head *free_me);
+
+void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
+int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
+int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
+struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
+void pnfs_error_mark_layout_for_return(struct inode *inode,
+ struct pnfs_layout_segment *lseg);
+/* nfs4_deviceid_flags */
+enum {
+ NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */
+ NFS_DEVICEID_UNAVAILABLE, /* device temporarily unavailable */
+ NFS_DEVICEID_NOCACHE, /* device may not be cached */
+};
+
+/* pnfs_dev.c */
+struct nfs4_deviceid_node {
+ struct hlist_node node;
+ struct hlist_node tmpnode;
+ const struct pnfs_layoutdriver_type *ld;
+ const struct nfs_client *nfs_client;
+ unsigned long flags;
+ unsigned long timestamp_unavailable;
+ struct nfs4_deviceid deviceid;
+ struct rcu_head rcu;
+ atomic_t ref;
+};
+
+struct nfs4_deviceid_node *
+nfs4_find_get_deviceid(struct nfs_server *server,
+ const struct nfs4_deviceid *id, struct rpc_cred *cred,
+ gfp_t gfp_mask);
+void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
+void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
+ const struct nfs4_deviceid *);
+bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
+void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
+bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
+void nfs4_deviceid_purge_client(const struct nfs_client *);
+
+/* pnfs_nfs.c */
+void pnfs_generic_clear_request_commit(struct nfs_page *req,
+ struct nfs_commit_info *cinfo);
+void pnfs_generic_commit_release(void *calldata);
+void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
+void pnfs_generic_rw_release(void *data);
+void pnfs_generic_recover_commit_reqs(struct list_head *dst,
+ struct nfs_commit_info *cinfo);
+int pnfs_generic_commit_pagelist(struct inode *inode,
+ struct list_head *mds_pages,
+ int how,
+ struct nfs_commit_info *cinfo,
+ int (*initiate_commit)(struct nfs_commit_data *data,
+ int how));
+int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
+void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
+void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
+struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
+ gfp_t gfp_flags);
+void nfs4_pnfs_v3_ds_connect_unload(void);
+int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
+ struct nfs4_deviceid_node *devid, unsigned int timeo,
+ unsigned int retrans, u32 version, u32 minor_version);
+struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
+ struct xdr_stream *xdr,
+ gfp_t gfp_flags);
+void pnfs_layout_mark_request_commit(struct nfs_page *req,
+ struct pnfs_layout_segment *lseg,
+ struct nfs_commit_info *cinfo,
+ u32 ds_commit_idx);
+void pnfs_lgopen_prepare(struct nfs4_opendata *data,
+ struct nfs_open_context *ctx);
+void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
+ struct nfs_open_context *ctx);
+void nfs4_lgopen_release(struct nfs4_layoutget *lgp);
+
+static inline bool nfs_have_layout(struct inode *inode)
+{
+ return NFS_I(inode)->layout != NULL;
+}
+
+static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
+{
+ return test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) == 0;
+}
+
+static inline struct nfs4_deviceid_node *
+nfs4_get_deviceid(struct nfs4_deviceid_node *d)
+{
+ atomic_inc(&d->ref);
+ return d;
+}
+
+static inline struct pnfs_layout_segment *
+pnfs_get_lseg(struct pnfs_layout_segment *lseg)
+{
+ if (lseg) {
+ refcount_inc(&lseg->pls_refcount);
+ smp_mb__after_atomic();
+ }
+ return lseg;
+}
+
+static inline bool
+pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg)
+{
+ return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0;
+}
+
+/* Return true if a layout driver is being used for this mountpoint */
+static inline int pnfs_enabled_sb(struct nfs_server *nfss)
+{
+ return nfss->pnfs_curr_ld != NULL;
+}
+
+static inline int
+pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
+ struct nfs_commit_info *cinfo)
+{
+ if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
+ return PNFS_NOT_ATTEMPTED;
+ return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
+}
+
+static inline struct pnfs_ds_commit_info *
+pnfs_get_ds_info(struct inode *inode)
+{
+ struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
+
+ if (ld == NULL || ld->get_ds_info == NULL)
+ return NULL;
+ return ld->get_ds_info(inode);
+}
+
+static inline void
+pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
+{
+ set_bit(NFS_DEVICEID_INVALID, &node->flags);
+}
+
+static inline bool
+pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
+ struct nfs_commit_info *cinfo, u32 ds_commit_idx)
+{
+ struct inode *inode = d_inode(req->wb_context->dentry);
+ struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
+
+ if (lseg == NULL || ld->mark_request_commit == NULL)
+ return false;
+ ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
+ return true;
+}
+
+static inline bool
+pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
+{
+ struct inode *inode = d_inode(req->wb_context->dentry);
+ struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
+
+ if (ld == NULL || ld->clear_request_commit == NULL)
+ return false;
+ ld->clear_request_commit(req, cinfo);
+ return true;
+}
+
+static inline int
+pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
+ int max)
+{
+ if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
+ return 0;
+ else
+ return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
+}
+
+static inline struct nfs_page *
+pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
+ struct page *page)
+{
+ struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
+
+ if (ld == NULL || ld->search_commit_reqs == NULL)
+ return NULL;
+ return ld->search_commit_reqs(cinfo, page);
+}
+
+/* Should the pNFS client commit and return the layout upon a setattr */
+static inline bool
+pnfs_ld_layoutret_on_setattr(struct inode *inode)
+{
+ if (!pnfs_enabled_sb(NFS_SERVER(inode)))
+ return false;
+ return NFS_SERVER(inode)->pnfs_curr_ld->flags &
+ PNFS_LAYOUTRET_ON_SETATTR;
+}
+
+static inline bool
+pnfs_ld_read_whole_page(struct inode *inode)
+{
+ if (!pnfs_enabled_sb(NFS_SERVER(inode)))
+ return false;
+ return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
+}
+
+static inline int
+pnfs_sync_inode(struct inode *inode, bool datasync)
+{
+ if (!pnfs_enabled_sb(NFS_SERVER(inode)))
+ return 0;
+ return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
+}
+
+static inline bool
+pnfs_layoutcommit_outstanding(struct inode *inode)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
+ test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
+}
+
+static inline int pnfs_return_layout(struct inode *ino)
+{
+ struct nfs_inode *nfsi = NFS_I(ino);
+ struct nfs_server *nfss = NFS_SERVER(ino);
+
+ if (pnfs_enabled_sb(nfss) && nfsi->layout) {
+ set_bit(NFS_LAYOUT_RETURN_REQUESTED, &nfsi->layout->plh_flags);
+ return _pnfs_return_layout(ino);
+ }
+
+ return 0;
+}
+
+static inline bool
+pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
+ struct nfs_server *nfss)
+{
+ return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
+ nfss->pnfs_curr_ld->id == src->l_type);
+}
+
+static inline u64
+pnfs_calc_offset_end(u64 offset, u64 len)
+{
+ if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset)
+ return NFS4_MAX_UINT64;
+ return offset + len - 1;
+}
+
+static inline u64
+pnfs_calc_offset_length(u64 offset, u64 end)
+{
+ if (end == NFS4_MAX_UINT64 || end <= offset)
+ return NFS4_MAX_UINT64;
+ return 1 + end - offset;
+}
+
+static inline void
+pnfs_copy_range(struct pnfs_layout_range *dst,
+ const struct pnfs_layout_range *src)
+{
+ memcpy(dst, src, sizeof(*dst));
+}
+
+static inline u64
+pnfs_end_offset(u64 start, u64 len)
+{
+ if (NFS4_MAX_UINT64 - start <= len)
+ return NFS4_MAX_UINT64;
+ return start + len;
+}
+
+/*
+ * Are 2 ranges intersecting?
+ * start1 end1
+ * [----------------------------------)
+ * start2 end2
+ * [----------------)
+ */
+static inline bool
+pnfs_is_range_intersecting(u64 start1, u64 end1, u64 start2, u64 end2)
+{
+ return (end1 == NFS4_MAX_UINT64 || start2 < end1) &&
+ (end2 == NFS4_MAX_UINT64 || start1 < end2);
+}
+
+static inline bool
+pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
+ const struct pnfs_layout_range *l2)
+{
+ u64 end1 = pnfs_end_offset(l1->offset, l1->length);
+ u64 end2 = pnfs_end_offset(l2->offset, l2->length);
+
+ return pnfs_is_range_intersecting(l1->offset, end1, l2->offset, end2);
+}
+
+static inline bool
+pnfs_lseg_request_intersecting(struct pnfs_layout_segment *lseg, struct nfs_page *req)
+{
+ u64 seg_last = pnfs_end_offset(lseg->pls_range.offset, lseg->pls_range.length);
+ u64 req_last = req_offset(req) + req->wb_bytes;
+
+ return pnfs_is_range_intersecting(lseg->pls_range.offset, seg_last,
+ req_offset(req), req_last);
+}
+
+extern unsigned int layoutstats_timer;
+
+#ifdef NFS_DEBUG
+void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
+#else
+static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
+{
+}
+
+#endif /* NFS_DEBUG */
+#else /* CONFIG_NFS_V4_1 */
+
+static inline bool nfs_have_layout(struct inode *inode)
+{
+ return false;
+}
+
+static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
+{
+}
+
+static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
+{
+}
+
+static inline struct pnfs_layout_segment *
+pnfs_get_lseg(struct pnfs_layout_segment *lseg)
+{
+ return NULL;
+}
+
+static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
+{
+}
+
+static inline int pnfs_return_layout(struct inode *ino)
+{
+ return 0;
+}
+
+static inline int pnfs_commit_and_return_layout(struct inode *inode)
+{
+ return 0;
+}
+
+static inline bool
+pnfs_ld_layoutret_on_setattr(struct inode *inode)
+{
+ return false;
+}
+
+static inline bool
+pnfs_ld_read_whole_page(struct inode *inode)
+{
+ return false;
+}
+
+static inline int
+pnfs_sync_inode(struct inode *inode, bool datasync)
+{
+ return 0;
+}
+
+static inline bool
+pnfs_layoutcommit_outstanding(struct inode *inode)
+{
+ return false;
+}
+
+
+static inline bool
+pnfs_roc(struct inode *ino,
+ struct nfs4_layoutreturn_args *args,
+ struct nfs4_layoutreturn_res *res,
+ const struct rpc_cred *cred)
+{
+ return false;
+}
+
+static inline void
+pnfs_roc_release(struct nfs4_layoutreturn_args *args,
+ struct nfs4_layoutreturn_res *res,
+ int ret)
+{
+}
+
+static inline bool
+pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
+{
+ return false;
+}
+
+static inline void set_pnfs_layoutdriver(struct nfs_server *s,
+ const struct nfs_fh *mntfh,
+ struct nfs_fsinfo *fsinfo)
+{
+}
+
+static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
+{
+}
+
+static inline int
+pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
+ struct nfs_commit_info *cinfo)
+{
+ return PNFS_NOT_ATTEMPTED;
+}
+
+static inline struct pnfs_ds_commit_info *
+pnfs_get_ds_info(struct inode *inode)
+{
+ return NULL;
+}
+
+static inline bool
+pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
+ struct nfs_commit_info *cinfo, u32 ds_commit_idx)
+{
+ return false;
+}
+
+static inline bool
+pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
+{
+ return false;
+}
+
+static inline int
+pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
+ int max)
+{
+ return 0;
+}
+
+static inline struct nfs_page *
+pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
+ struct page *page)
+{
+ return NULL;
+}
+
+static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
+{
+ return 0;
+}
+
+static inline bool
+pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
+ struct nfs_server *nfss)
+{
+ return false;
+}
+
+static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
+{
+ return NULL;
+}
+
+static inline void nfs4_pnfs_v3_ds_connect_unload(void)
+{
+}
+
+static inline bool nfs4_layoutreturn_refresh_stateid(nfs4_stateid *dst,
+ struct pnfs_layout_range *dst_range,
+ struct inode *inode)
+{
+ return false;
+}
+
+static inline void pnfs_lgopen_prepare(struct nfs4_opendata *data,
+ struct nfs_open_context *ctx)
+{
+}
+
+static inline void pnfs_parse_lgopen(struct inode *ino,
+ struct nfs4_layoutget *lgp,
+ struct nfs_open_context *ctx)
+{
+}
+
+static inline void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
+{
+}
+
+static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
+{
+ return false;
+}
+
+#endif /* CONFIG_NFS_V4_1 */
+
+#if IS_ENABLED(CONFIG_NFS_V4_2)
+int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
+#else
+static inline int
+pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
+{
+ return 0;
+}
+#endif
+
+#endif /* FS_NFS_PNFS_H */